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A) correct, the equation must be correct.

B) correct, the equation may be wrong.

C) incorrect, the equation may be correct.

D) incorrect, the equation must be wrong.

E) correct, the equation may be correct.

Hint: An equation is dimensionally correct if both sides of the equation have the same dimensions. For instance, the equation x = (1/2)*a*t^2 has the units of length (meters) on both sides, because the units of a*t^2 are (m/s^2)*s^2 = m. The equation x = a*t is dimensionally incorrect, because the units on the left are length (meters), but the units on the right are (m/s^2)*s = m/s, the units of speed.

**Which statements are correct?**